def hello(name):
    print('hello',name,'你好：',name)
    
hello('吴桂荣')

def hello2(name):
    return print('hello',name,'你好：',name)
    
r = hello2('吴桂荣')
if r==None :
    print("hello2 return None")

def spam():
    global eggs
    eggs = 'spam'

eggs = 'global'
spam()
print(eggs)